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Commitments and Contingencies (Textual) (Details) |  |  |  |  | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 18, 2018 | Jul. 01, 2016 USD ($) a | Dec. 03, 2015 ft² | Apr. 02, 2015 USD ($) | Jun. 30, 2018 USD ($) Parcel | May 04, 2018 USD ($) | Mar. 16, 2018 a | Oct. 13, 2017 USD ($) | Apr. 28, 2017 a | Jan. 30, 2017 a
Subaru Build-to-Service Center Project [Member] |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |
Lease terms |  |  | 18 years |  |  |  |  |  |  |
Rentable Square Feet | ft² |  |  | 83,000 |  |  |  |  |  |  |
Purchase option of lease from inception period |  |  | 5 years |  |  |  |  |  |  |
Estimated project costs |  |  |  |  | $ 46,900,000 |  |  |  |  |
Developer profit percentage | 8.00% |  |  |  |  |  |  |  |  |
Period following substantial completion of project to determine closing date | 30 days |  |  |  |  |  |  |  |  |
Period following completion of punch list items to determine closing date | 3 days |  |  |  |  |  |  |  |  |
Subaru Build-to-Service Center Project [Member] | Other Assets [Member] |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |
Project costs funded |  |  |  |  | 22,900,000 |  |  |  |  |
Unconsolidated Real Estate Ventures [Member] |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |
Real estate ventures aggregate indebtedness |  |  |  |  | 645,500,000 |  |  |  |  |
PJP VII [Member] |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |
Guarantees, maximum exposure amount |  |  |  |  | 400,000 |  |  |  |  |
Real estate property debt |  |  |  |  | 4,200,000 |  |  |  |  |
4040 Wilson Venture [Member] |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |
Guarantees, maximum exposure amount |  |  |  |  | 41,300,000 |  |  |  |  |
Loan total borrowing capacity |  |  |  |  | 150,000,000 |  |  |  |  |
618 Market Street [Member] |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent consideration, liability |  |  |  | $ 2,000,000 | 1,900,000 |  |  |  |  |
Fair value of contingent consideration |  |  |  | 1,600,000 |  |  |  |  |  |
Interest expense |  |  |  | $ 2,000,000 |  |  |  |  |  |
One Drexel Plaza [Member] |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |
Expected excess redevelopment funding |  |  |  |  | 37,300,000 |  |  |  |  |
Estimated aggregate cost |  |  |  |  | 83,100,000 |  |  |  |  |
Acquisition cost, inclusive in estimated aggregate cost |  |  |  |  |  |  |  | $ 37,800,000 |  |
Schuylkill Yards [Member] |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |
Required spending in capital improvements to property |  |  |  |  | 3,400,000 |  |  |  |  |
Estimated potential additional contribution obligation |  |  |  |  | $ 700,000 |  |  |  |  |
Garza Land Acquisition [Member] |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |
Acreage of land | a |  | 34.6 |  |  |  |  |  |  |  |
Gross purchase value of assets |  | $ 20,600,000 |  |  |  |  |  |  |  |
Number of Parcels | Parcel |  |  |  |  | 3 |  |  |  |  |
Garza Land Acquisition [Member] | Parcel One [Member] |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |
Area of land sold | a |  |  |  |  |  |  |  |  | 8.4 |
Garza Land Acquisition [Member] | Parcel Two [Member] |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |
Area of land sold | a |  |  |  |  |  |  |  |  |  | 1.7
Garza Land Acquisition [Member] | Parcel Three [Member] |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |
Area of land sold | a |  |  |  |  |  |  | 6.6 |  |  |
Put Agreement [Member] |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  | $ 35,000,000 |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |
Lease terms |  |  |  |  | 11 years |  |  |  |  |
Minimum [Member] | One Drexel Plaza [Member] |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |
Required spending in capital improvements to property |  |  |  |  | $ 8,000,000 |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |
Lease terms |  |  |  |  | 67 years |  |  |  |  |
Mortgage Lenders [Member] |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |
Associated letter of credit |  |  |  |  | $ 0 |  |  |  |  |

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